Weather in Key West in August 2018

Expect 32°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Key West in August. Check more long-term weather averages for Key West in August before you book your next holiday to Florida in 2018.

Guide to Key West weather in August

The average maximum daytime temperature in Key West in August is a hot 32°C (90°F) with very high heat & humidity. The average night-time temperature is usually a warm 26°C (79°F). There are usually 10 hours of bright sunshine each day, which represents 74% of the 13 hours of daylight.

Expect 125mm (4.9 inches) of rainfall across the whole of August with 15 days with some rain falling. Maximum UV levels will be extreme (11 UV index) at midday when the skies are clear.

The average sea temperature in and around Key West in August is 30°C (86°F).